我根据教程《CentOS 6.3 环境搭建discuz论坛 》http://bbs.qcloud.com/thread-1316-1-1.html进行环境搭建部署,发现mysql并不能启动,报错如下:root@VM_203_146_centos bin# service mysqlstartRedirecting to /bin/systemctl start mysql.serviceFailed to issue method call: Unitmysql.service failed to load: No such file or directory.是不是目前命令有改动?附上配置